Lesson Plan

Factor Friend or Foe?

Which number doesn't belong? This lesson requires students to think critically as they determine which number is not a factor of a particular number. Teach it on its own or as support for the lesson Factors Over the Rainbow.
Download lesson plan
This lesson can be used as a pre-lesson for the Factors Over the Rainbowlesson plan.
View aligned standards
This lesson can be used as a pre-lesson for the Factors Over the Rainbowlesson plan.



Students will be able to find all factor pairs for a given number.


Students will be able to distinguish a factor from a non-factor and explain their reasoning using sentence starters and interactive supports.


(4 minutes)
Factor or Not?Vocabulary Cards: Factor Friend or Foe?Glossary: Factor Friend or Foe?Teach Background Knowledge TemplateWrite Student-Facing Language Objectives Reference
  • Ask students to turn to a partner and share their background knowledge on multiplication. Ask the following guiding questions to spark conversation: "What does multiplication mean? When do you need to multiply numbers? How do we show or represent multiplication?"
  • Listen in on students' conversations and have them share with the whole group some of their key points. Guide students to the understanding that multiplication is when you add a number to itself a certain number of times. Some ways we can show multiplication include arrays, repeated addition, equal groups of items, a multiplication chart, etc. Record students' ideas and important points from the discussion on the board.
  • Explain that today we will explore an important concept related to multiplication called factors.

Related Guided Lesson

Fractions 2

4 online games
11 online exercises
5 printable worksheets
View Guided Lesson
fourth grade
Subject Math